Furnace door



Feb. 10, 1925.

J. T. HAEUSSER FURNACE DOOR Filed Sepi. 8, 1924 V/7a? W m MM 5). Mama/w ATTORNEYS Patented Feb. 10, 1925.

,MUNITED STATES JOHN T. HAEUSSER, or wns'r ALBANY, NEW YORK.

FURNACE DOOR.

Application filed September To all whom it may concern:

Be it known that I, J OHN T. HAnUssnn, a citizen of the United States, and resident of West Albany, in the county of Albany and State of New York, have invented a new and Improved Furnace Door, of which the following is a full, clear, and exact description.

This invention has relation to furnace doors and has particular reference to an improvement in the construction of the fire box door of a furnace.

One of the main objects of the present invention is to provide a furnace 'door equipped with means for injecting into the combustion chamber aplurality of jets of partially heated air whereby to promote a more thorough combustion of the products of combustion.

The invention furthermore aims to provide means for effectually preventing overheating of the door.

As a still further object the invention contemplates an improved furnace door construction which is comparatively simple, does not materially increase the cost of production of the same and which is highly efficient in its purpose.

lVith the above recited and other objects in view, the invention resides in the novel construction set forth in the following specification, particularly pointed out in the appended claims and illustrated in the ac companying drawings, it being understood that the right is reserved to embodiments other than those actually illustrated herein, to the full extent indicated by the general meaning of the terms in which the claims are expressed.

In the drawings- Figure 1 is a vertical sectional view through the door.

Fig. 2 is a detail fragmentary horizontal sectional view taken approximately on the line 2-2 of Figure 1.

Fig. 3 is a detail cross sectional view taken ap roximately on the line 33 of Fig. 1.

eferring to the drawings by characters of reference 10 designates a furnace door having the usual draft openings 11 therein and. draft valve 12 for controlling the entrance of air through the openings 11. The door lining member 13 is secured by screws 1 1 to the inner face of the door and is provided with marginal flanges 15. The free edges thereof, which abut the inner surface 8, 1924. Serial No. 736,549.

of the door are extremely thin to minimize the conduction of the heat from the lining to the door. The door lining 13 together with the marginal flanges define an air receiving space 16. The lining is provided with a plurality of inwardly projecting 1njector nozzles 17 each having a bore 18 for the major portion of its length which bore 18comn1unicates with a reduced outlet bore 19 at the inner end of the nozzle 17 and de fines an annular shoulder 20 at the j uncture of the bores. The outer end of the bore 18 extends through the lining 13 and communicates with the air space 16. A? combined baflie and heat conducting member 21 which is preferably constructed from a single length of material bent upon itself to pro vide a pair of resilient legs 22 connected by a head 23 is provided. The legs 22 are provided with marginal angularly bent side edges 24 which are inserted in the nozzles or nipples 17 so that the free ends of the legs abut the annular shoulder 20 at diametrically opposite points and the angular side edges 24: of said legs contact with the bore 18 throughout its length, with the head 23 projecting beyond the outer face of the door lining and disposed within the air space 16.

In use and operation of the device, when the draft valve 12 is opened the air from the exterior of the furnace will be drawn by the natural draft in the furnace, into the air space 16 where it will be partially preheated and thus directed through the bores 18 and 19 of the nipples or nozzles 17. The members 21 will serve to retard the velocity of the air which will move between the confronting faces of the legs 22 and between the outer faces of the legs and the bores 18 of the nipples whereby to permit the heating of the same before its injection into the combustion chamber of the furnace. The contacting marginal angular side edges 24: of the legs 22 will also act as conductors for heating the air and for cooling off the nipples or nozzles 17 so that the heated air uniformly injected into the combustion chamher in jets will serve to promote a more thorough combustion of the products of combustion.

I claim:

1. In a furnace door, a door lining member secured thereto having marginal flanges engaging the inner surface of the door to define an air space, said door having valved air receiving space and the" combustion chamber of the furnace whereby to. 11111-7.

formly inject into the fire box a plurality of jets of pre-heatedair for promoting a better combustion in the furnace and means engaging within said nozzles or nipples for retardingthe velocity of the air to permit of the heating ofrtheisame prior to its'discharge into' the combustion chamber, said means also serviirgas a conductor for assistingin the heating of the-air and cooling oil of the nipples or nozzles; said means comprising a pair of resilie'ntlegs engageable within the bore ofth'e, nipples or nozzles and. connectedat one end by an integral head.

2. In a furnace door, a door lining-anember, secured thereto having marginal: flanges engaging the inner surface of the 'door to define an air space; said doorrhaving valved air inlets communicating with said air space anda plurality of inwardly projecting-nozzles or nipples on said door lining having bores communicating respectively with the air receiving space and the com bastion-chamber of the'furnace whereby to uniformly inject into the fire box a plurality of jets of pre-heated air for promoting a v better. combustion in the furnace and means engaging within said nozzles or nipples for retarding the velocity of theair to permit of the heating: of the same priorv to its discharge into thecombustion chamber, said means also serving asa conductor for assisting in theheating of the air and cooling off of the" nipples or nozzles, saidmiea-ns. comprising-a pair of resilientzlegs cngageable within the bore of the nipples or nozzles and connected at one end by an integral head, the said nipples or nozzles each havinga reduced-bore portion at their inner end defining an annular shoulder against which thefree inner terminals ofthe legs abut.

JOHN T. HA EUSSTQR. 

